SMC Networks ASN2 Series User manual

Doc. no. AS＊-OMP0006-B

PRODUCT NAME

METERING VALVE WITH SILENCER

MODEL / Series / Product Number

ASN2 Series

Contents

1．Safety Instructions 2 ～3

2．Specific Product Precautions 4 ～6

3．Application 7

4．Specifications 7

5．Troubleshooting 7

6．Construction 7

-1-

- 2 -

Metering Valve with Silencer

Safety Instructions

These safety instructions are intended to prevent hazardous situations and/or equipment damage.

These instructions indicate the level of potential hazard with the labels of "Caution", "Warning" and

"Danger". They are all important notes for safety and must be followed in addition to International Standards

(ISO/ IEC)*1) and other safety regulations.

*1) ISO 4414: Pneumatic fluid power -- General rules relating to systems.

ISO 4413: Hydraulic fluid power -- General rules relating to systems.

IEC 60204-1: Safety of machinery -- Electrical equipment of machines..(Part 1: General requirements)

ISO 10218: Manipulating industrial robots –Safety.

etc.

Caution

Caution indicates a hazard with a low level of risk which, if not avoided, could result in minor or

moderate injury.

Warning

Warning indicates a hazard with a medium level of risk which, if not avoided, could result in

death or serious injury.

Danger

Danger indicates a hazard with a high level of risk which, if not avoided, will result in death or

serious injury.

Warning

1. The compatibility of the product is the responsibility of the person who designs the equipment

or decides its specifications.

Since the product specified here is used under various operating conditions, its compatibility with specific

equipment must be decided by the person who designs the equipment or decides its specifications based on

necessary analysis and test results.

The expected performance and safety assurance of the equipment will be the responsibility of the person who

has determined its compatibility with the product.

This person should also continuously review all specifications of the product referring to its latest catalog

information, with a view to giving due consideration to any possibility of equipment failure when configuring the

equipment.

2. Only personnel with appropriate training should operate machinery and equipment.

The product specified here may become unsafe if handled incorrectly.

The assembly, operation and maintenance of machines or equipment including our products must be

performed by an operator who is appropriately trained and experienced.

3. Do not service or attempt to remove product and machinery/equipment until safety is confirmed.

1. The inspection and maintenance of machinery/equipment should only be performed after measures to

prevent falling or runaway of the driven objects have been confirmed.

2. When the product is to be removed, confirm that the safety measures as mentioned above are implemented

and the power from any appropriate source is cut, and read and understand the specific product precautions

of all relevant products carefully.

3. Before machinery/equipment is restarted, take measures to prevent unexpected operation and malfunction.

4. Contact SMC beforehand and take special consideration of safety measures if the product is to

be used in any of the following conditions.

1. Conditions and environments outside of the given specifications, or use outdoors or in a location exposed to

direct sunlight.

2. Installation on equipment in conjunction with atomic energy, railways, air navigation, space, shipping,

vehicles, military, medical treatment, combustion and recreation, or equipment in contact with food and

beverages, emergency stop circuits, clutch and brake circuits in press applications, safety equipment or

other applications unsuitable for the standard specifications described in the product catalog.

3. An application which could have negative effects on people, property, or animals requiring special safety

analysis.

4. Use in an interlock circuit, which requires the provision of double interlock for possible failure by using a

mechanical protective function, and periodical checks to confirm proper operation.

- 3 -

Metering Valve with Silencer

Safety Instructions

Caution

The product is provided for use in manufacturing industries.

The product herein described is basically provided for peaceful use in manufacturing industries.

If considering using the product in other industries, consult SMC beforehand and exchange specifications

or a contract if necessary.

If anything is unclear, contact your nearest sales branch.

LimitedwarrantyandDisclaimer/ComplianceRequirements

The product used is subject to the following “Limited warranty and Disclaimer” and “Compliance

Requirements”.

Read and accept them before using the product.

Limited warranty and Disclaimer

1. The warranty period of the product is 1 year in service or 1.5 years after the product is delivered,

whichever is first.

Also, the product may have specified durability, running distance or replacement parts. Please

consult your nearest sales branch.

2. For any failure or damage reported within the warranty period which is clearly our responsibility,

a replacement product or necessary parts will be provided.

This limited warranty applies only to SMC product independently, and not to any other damage

incurred due to the failure of the product.

3. Prior to using SMC products, please read and understand the warranty terms and disclaimers

noted in the specified catalog for the particular products

Compliance Requirements

1. The use of SMC products with production equipment for the manufacture of weapons of mass

destruction (WMD) or any other weapon is strictly prohibited.

2. The exports of SMC products or technology from one country to another are governed by the

relevant security laws and regulations of the countries involved in the transaction. Prior to the

shipment of a SMC product to another country, assure that all local governing that export are

known and followed.

Caution

SMC products are not intended for use as instruments for legal metrology.

Measurement instruments that SMC manufactures or sells have not been qualified by type approval tests

relevant to the metrology (measurement) laws of each country.

Therefore, SMC products cannot be used for business or certification ordained by the metrology

(measurement) laws of each country.

! Caution

SMC products are not intended for use as instruments for legal metrology.

Measurement instruments that SMC manufactures or sells have not been qualified by type approval tests

relevant to the metrology (measurement) laws of each country.

Therefore, SMC products cannot be used for business or certification ordained by the metrology

(measurement) laws of each country.

- 4 -

2. Specific Product Precautions

Warning

(1) Confirm the specifications.

Products represented in this catalog are designed

only for use in compressed air systems.

Do not operate at pressures, temperatures, etc.,

beyond the range of specifications, as this can cause

damage or malfunction.(Refer to the specifications.)

Please contact SMC when using a fluid other than

compressed air.

We do not guarantee against any damage if the

product is used outside of the specification range.

(2) Products mentioned in this catalog are not

designed for use as stop valves with zero air

leakage.

A certain amount of leakage is allowed in the

products’specifications. Tightening the needle to

reduce leakage to zero may result in equipment

damage.

(3) Do not disassemble the product or make

any modifications, including additional

machining.

Doing so may cause human injury and/or injury an

accident.

(4) The flow rate characteristics for each

product are representative values.

The flow rate characteristics are characteristics of

each individual product. Actual values may differ

depending on the piping, circuitry, pressure

conditions, etc. Also, depending on product

specifications, there may be variations in the zero

needle rotations position of the flow rate

characteristics.

(5) Check if PTFE can be used in the

application.

PTFE powder (Polytetrafluoroethylene resin) is

Included in the seal material of the male thread

type piping taper thread. Confirm that the use of it

will not cause any adverse effects on the system.

Please contact SMC if the Safety Data

Sheet (SDS) is required.

(6) Example of inapplicable circuits

Warning

(1) Operation Manual

Install the product and operate it only after reading

the operation manual carefully and understanding its

contents. Also, keep the manual where is can be

referred to as necessary.

(2) Ensure sufficient space for maintenance

activities.

When installing the products, allow access for

maintenance and inspection.

(3) Confirm that the lock nut is tightened.

A loose lock nut may cause speed changes in the

actuator.

(4) Check the number of opening and closing

rotations of the needle valve.

It is not possible to remove the needle valve

completely, over rotation will cause damage to the

product.

(5) Do not use tools, such as pliers, to rotate

the knob.

This can cause the idle rotation of the knob or

damage.

(6) Tighten threads with the proper tightening

torque.

When installing the products, follow the listed

torque specifications.

(7) Adjust the needle by opening the needle

slowly after having closed it completely.

Loose needle valves may cause unexpected

sudden actuator extension. When a needle valve is

turned clockwise, it is closed and cylinder speed

decreases. When a needle valve is turned

counterclockwise, it is open and cylinder speed

increases.

(8) Do not apply excessive force or shock to the

body with an impact tool.

This can cause damage or air leakage.

(9) To install/remove the flow control equipment,

use an appropriate wrench to tighten/loosen

the supplied nut on body B as close to the

thread as possible.

Do not apply torque at other points, as the product

may be damaged.

(10)

Design/ Selection

Mounting

- 5 -

Caution

(1) First, tighten the fitting by hand, then use a

suitable wrench to tighten the hexagonal

portion of the body a further two or three turns.

For the reference value for the tightening

torque, refer to the table below. Check the

dimensions of each product for the width

across flats.

(2) M5 and 10-32 UNF

First, tighten it by hand, then give it an additional

1/6 turn to 1/4 turn with a wrench. The reference

value for the tightening torque is 1 to 1.5N・m.

※Excessive tightening may damage the thread

portion or deform the gasket and cause air leakage.

If the screw is too shallowly screwed in, it may come

loose or air may leak.

(3)Chamfered female thread size of the

connection thread M5, 10-32UNF

In compliance with ISO16030 Standards (air

pressure fluid dynamics –connection –ports and

stud ends), the chamfered thread sizes shown

below are recommended.

(4) The proper tightening torques for hexagon

lock nuts are shown in the table below. For

standard installation, turn 15 to 30°using a

tool, after fastening by hand.

Pay attention not to over tighten the product for

the width across flats.

Caution

(1) Preparation before piping

Before piping is connected, it should be

thoroughly blown out with air (flushing) or washed

to remove chips, cutting oil, and other debris from

inside the pipe.

Caution

(2) Winding of sealant tape

When screwing piping or fittings into ports, ensure

that chips from the pipe threads or sealing material

do not enter the piping. Also, if sealant tape is used,

leave 1 thread ridge exposed at the end of the

threads.

Warning

(1) Type of fluids

Please consult with SMC when using the product

in applications other than compressed air.

(2) When there is a large amount of drainage

Compressed air containing a large amount of

drainage can cause malfunction of pneumatic

equipment. An air dryer or water separator should

be installed upstream from filters.

(3) Drain flushing

If condensation in the drain bowl is not emptied on

a regular basis, the bowl will overflow and allow

the condensation to enter the compressed air

lines. This causes malfunction of pneumatic

equipment.

If the drain bowl is difficult to check and remove,

the installation of a drain bowl with an auto drain

option is recommended.

For compressed air quality, refer to the Best

Pneumatics No.6 catalog.

(4) Use clean air.

Do not use compressed air that contains

chemicals, synthetic oils that include organic

solvents, salts or corrosive gases, etc., as it can

cause damage or malfunction.

Caution

(1) Install an air filter.

Install an air filter upstream near the valve.

Select an air filter with a filtration size of 5μm or

smaller.

(2) Take measures to ensure air quality, such

as by installing an aftercooler, air dryer, or

water separator.

Compressed air that contains a large amount

of drainage can cause the malfunction of

pneumatic equipment, such as flow control

equipment. Therefore, take appropriate

measures to ensure air quality, such as by

providing an aftercooler, air dryer, or water

separator.

(3) Ensure that the fluid and ambient

temperatures air within the specified

range.

If the fluid temperature is 5℃or less, the

moisture in the circuit could freeze, causing

damage to the seals or leading to equipment

malfunction. Therefore, take appropriate

measures to prevent freezing. For compressed

air quality, refer to the Best Pneumatics No.6

catalog.

Female thread size

Chamfered port size ΦD

(Recommended value)

3.1 to 3.4

10-32UNF

5.1 to 5.3

Air Supply

Piping

Mounting

Piping

- 6 -

Warning

(1) Do not use in an atmosphere containing

corrosive gases, chemicals, sea water, water

steam, or where there is direct contact with

any of these.

Refer to each construction drawing for information

on the materials of flow control equipment.

(2) Do not expose the product to direct sunlight

for an extended period of time.

(3) Do not use in a place subject to heavy

vibration and/or shock.

(4) Do not mount the product in locations where

it is exposed to radiant heat.

Warning

(1) Perform maintenance and inspection

according to the procedures indicated in

the operation manual.

If handled improperly, malfunction or damage of

machinery and equipment may occur.

(2) Maintenance work

If handled improperly, compressed air can be

dangerous. Assembly, handling, repair and

element replacement of pneumatic systems

should be performed by a knowledgeable and

experienced person.

(3) Drain flushing

Remove drainage from air filters regularly.

(4) Removal of equipment, and supply/exhaust

of compressed air

Before components are removed, first confirm that

measures are in place to prevent workpieces from

dropping, run-away equipment, etc. Then, cut off the

supply pressure and electric power, and exhaust

all compressed air from the system using the

residual pressure release function.

When machinery is restarted, proceed with caution

after confirming that appropriate measures are in

place to prevent sudden movement.

Operating environment

Maintenance

- 7 -

3. Application

This product is designed to control the speed of a pneumatic actuator.

4. Specifications

WORKING FLUID

AIR

WORKING PRESS.RANGE

0～1MPa

PROOF PRESS

1.5MPa

AMBIENI TEMP. AND WORKING FLUID TEMP.

-5～60℃(NO FREEZING)

5．Troubleshooting

Trouble

Possible cause

Countermeasures

The speed (flow

rate) cannot be

controlled.

Dust inside

Fully open the needle and apply air blow

from the screw. If the problem in not

solved even after air blow, install an air

filter to the piping, and replace the

product with a new one.

6．Construction

ASN2-M5,U10/32 ASN2-01～04

ASN2-N01～N04

No. Description Material

Handle PBT

Needle Brass

Lock nut Steel wire

Needle guide Brass

Washer Steel

Cover PE

O ring NBR

Sponge PVA Sponge

Body B Brass

Gasket NBR/Stainless

Remarks

Electroless nickel plating

M5,U10/32

Electroless nickel plating

Revision history

4-14-1, Sotokanda, Chiyoda-ku, Tokyo 101-0021 JAPAN

Tel: + 81 3 5207 8249 Fax: +81 3 5298 5362

URL https://www.smcworld.com

Note: Specifications are subject to change without prior notice and any obligation on the part of the manufacturer.

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